AOZ1960DI

AOZ1960DI Datasheet

AOZ1960

Part	Datasheet
AOZ1960DI	AOZ1960DI (pdf)

PDF Datasheet Preview
AOZ1960 Multi-String Boost White LED Driver The AOZ1960 is a high-efficiency boost regulator with integrated 55V boost switch and 30V input protection switch. It is designed to drive 6 parallel strings of multiple series-connected white LEDs for LCD backlight applications. The current of each string is individually regulated by an internal current regulator. The AOZ1960 has a wide input voltage range from 7V to 24V. The maximum LED current can be adjusted from 15mA to 30mA using an external resistor connected to ISET pin. The AOZ1960 support two dimming control modes to enable a wide variety of applications. In analog dimming mode, the LED current can be directly adjusted through ABRT pin to achieve 10% to 100% brightness range. In digital dimming mode, a PWM signal on DBRT controls the brightness by turning the current regulators on and off. The brightness is proportional to the duty cycle of the PWM signal. The AOZ1960 has multiple features to protect the regulator under fault conditions. An internal 30V input protection switch protects against catastrophic failure conditions such as output short-circuits. A separate over-voltage protection OVP loop limits the output voltage if LED strings fail open. Cycle-by-cycle over-current protection OCP limits the peak inductor current. Built-in soft-start minimizes the inrush current during startup. Thermal shutdown provides another level of protection. The integrated 55V power MOSFET reduces the cost and external component count, while allowing output voltages as high as 55V. Low dropout voltage of LED current regulator 500mV minimizes power loss. In addition, automatic pulse skipping operation improves efficiency at light loads. The AOZ1960 features programmable switching frequency allows for trade-offs between solution size and electrical efficiency. The AOZ1960 is available in a thermally enhanced 24-pin 7mm x 4mm DFN package and operates over the temperature range of -40°C to +85°C. z 7V to 24V input voltage range z Integrated 30V input switch z 55V/2A internal N-channel MOSFET z Six parallel strings z Programmable switching frequency z 500mV low dropout current regulator z Resistor programmable maximum LED current z Analog dimming via ABRT pin z Digital PWM dimming via DBRT pin z Dimming range with 8-bit resolution z Cycle-by-cycle current limit z Open and short LED protection z Output over-voltage and short protection z Thermal overload protection z Internal Soft-start z 7mm x 4mm DFN package z Notebook PC display z Tablet PC display z Desktop monitors z Portable DVD players z Digital photo frames z Car navigation display Page 1 of 20 Typical Application Circuit 1kΩ INPUT 6V TO 24V C1 22uF 10uH LX C5 1uF R3 100kΩ FAULT BIAS AGND PGND AOZ1960DI COMP ENABLE ANALOG DIMMING DIGITAL DIMMING R6 84.5kΩ EN ABRT DBRT FSET ISET LED1 LED2 LED3 LED4 LED5 LED6 R1 500kΩ R2 12.5kΩ C4 4.7uF C8 4.7uF R5 10kΩ C6 100nF R4 46.4kΩ AOZ1960 Ordering Information Part Number AOZ1960DI Ambient Temperature Range -40°C to +85°C Package 7 x 4 DFN-24 AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information. Environmental Green Product Page 2 of 20 Pin Configuration IN 1 EN 2 BIAS 3 ISET 4 AGND 5 COMP 6 FSET 7 AGND 8 ABRT 9 DBRT 10 FLT 11 OVP 12 AOZ1960DI LIN AGND 24 LIN 23 LIN 22 LED1 21 LED2 20 LED3 19 AGND 18 LED4 17 LED5 16 LED6 15 PGND 14 LX 13 LX 7x4 DFN-24 Top View AOZ1960 Page 3 of 20 AOZ1960 Pin Description Pin Number 1 2 Pin Name IN EN BIAS ISET 5, 8, 19 6 AGND COMP FSEL ABRT 13, 14 15 16 17 18 20 21 22 23, 24 DBRT LX PGND LED6 LED5 LED4 LED3 LED2 LED1 Pin Function Input Supply Pin. Enable Input. Pull EN above 2V to enable the LED driver and pull EN below 0.8V to disable the LED driver. Internal 5V Linear Regulator Output. Connect a minimum 0.22uF ceramic capacitor from BIAS to ground. LED Current Set Pin. Connect a resistor from ISET to ground to set the nominal LED current 100% brightness for each string. Analog ground. Compensation Pin. COMP is the output of the internal error amplifier. Connect a RC network from COMP to ground to compensate the control loop. Frequency Select Pin. Connect FSEL to ground via a resistor to set the switching frequency. Analog Brightness Control Input. ABRT controls the LED brightness by adjusting the LED current in proportion to ABRT voltage. The input range of ABRT is between 0 to 2V. When VBRT is below 0.2V, the LED current is 10% of the nominal setting. When BRT voltage is 2V or above, the LED current is 100% of the normal setting. PWM Brightness Control Input. DBRT controls the LED brightness by turning the LED on and off using a PWM signal. The brightness is proportional to the PWM duty. Fault Output. FLT is an open-drain output. Connect a pull-up resistor between BIAS and FLT. Over-voltage protection Input. Use a voltage divider to set the boost regulator output over-voltage protection threshold.

PDF Datasheet Preview

AOZ1960

Multi-String Boost White LED Driver

The AOZ1960 is a high-efficiency boost regulator with integrated 55V boost switch and 30V input protection switch. It is designed to drive 6 parallel strings of multiple series-connected white LEDs for LCD backlight applications. The current of each string is individually regulated by an internal current regulator. The AOZ1960 has a wide input voltage range from 7V to 24V. The maximum LED current can be adjusted from 15mA to 30mA using an external resistor connected to ISET pin.

The AOZ1960 support two dimming control modes to enable a wide variety of applications. In analog dimming mode, the LED current can be directly adjusted through ABRT pin to achieve 10% to 100% brightness range. In digital dimming mode, a PWM signal on DBRT controls the brightness by turning the current regulators on and off. The brightness is proportional to the duty cycle of the PWM signal.

The AOZ1960 has multiple features to protect the regulator under fault conditions. An internal 30V input protection switch protects against catastrophic failure conditions such as output short-circuits. A separate over-voltage protection OVP loop limits the output voltage if LED strings fail open. Cycle-by-cycle over-current protection OCP limits the peak inductor current. Built-in soft-start minimizes the inrush current during startup. Thermal shutdown provides another level of protection.

The integrated 55V power MOSFET reduces the cost and external component count, while allowing output voltages as high as 55V. Low dropout voltage of LED current regulator 500mV minimizes power loss. In addition, automatic pulse skipping operation improves efficiency at light loads. The AOZ1960 features programmable switching frequency allows for trade-offs between solution size and electrical efficiency.

The AOZ1960 is available in a thermally enhanced 24-pin 7mm x 4mm DFN package and operates over the temperature range of -40°C to +85°C.
z 7V to 24V input voltage range z Integrated 30V input switch z 55V/2A internal N-channel MOSFET z Six parallel strings z Programmable switching frequency z 500mV low dropout current regulator z Resistor programmable maximum LED current z Analog dimming via ABRT pin z Digital PWM dimming via DBRT pin z Dimming range with 8-bit resolution z Cycle-by-cycle current limit z Open and short LED protection z Output over-voltage and short protection z Thermal overload protection z Internal Soft-start z 7mm x 4mm DFN package
z Notebook PC display z Tablet PC display z Desktop monitors z Portable DVD players z Digital photo frames z Car navigation display

Page 1 of 20

Typical Application Circuit
1kΩ

INPUT
6V TO 24V C1
22uF
10uH LX

C5 1uF

R3 100kΩ FAULT

BIAS

AGND

PGND

AOZ1960DI

COMP

ENABLE

ANALOG DIMMING DIGITAL DIMMING

R6 84.5kΩ

EN ABRT DBRT FSET

ISET

LED1 LED2 LED3 LED4 LED5 LED6

R1 500kΩ

R2 12.5kΩ

C4 4.7uF

C8 4.7uF

R5 10kΩ

C6 100nF

R4 46.4kΩ

AOZ1960
Ordering Information

Part Number AOZ1960DI

Ambient Temperature Range -40°C to +85°C

Package 7 x 4 DFN-24

AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information.

Environmental Green Product

Page 2 of 20

Pin Configuration

IN 1 EN 2 BIAS 3 ISET 4 AGND 5 COMP 6 FSET 7 AGND 8 ABRT 9 DBRT 10 FLT 11 OVP 12

AOZ1960DI

LIN AGND
24 LIN 23 LIN 22 LED1 21 LED2 20 LED3 19 AGND 18 LED4 17 LED5 16 LED6 15 PGND 14 LX 13 LX
7x4 DFN-24

Top View

AOZ1960

Page 3 of 20

AOZ1960

Pin Description

Pin Number 1 2

Pin Name IN EN

BIAS

ISET
5, 8, 19 6

AGND COMP

FSEL

ABRT
13, 14 15 16 17 18 20 21 22
23, 24

DBRT

LX PGND LED6 LED5 LED4 LED3 LED2 LED1

Pin Function

Input Supply Pin.

Enable Input. Pull EN above 2V to enable the LED driver and pull EN below 0.8V to disable the LED driver. Internal 5V Linear Regulator Output. Connect a minimum 0.22uF ceramic capacitor from BIAS to ground.

LED Current Set Pin. Connect a resistor from ISET to ground to set the nominal LED current 100% brightness for each string.

Analog ground.

Compensation Pin. COMP is the output of the internal error amplifier. Connect a RC network from COMP to ground to compensate the control loop.

Frequency Select Pin. Connect FSEL to ground via a resistor to set the switching frequency.

Analog Brightness Control Input. ABRT controls the LED brightness by adjusting the LED current in proportion to ABRT voltage. The input range of ABRT is between 0 to 2V. When VBRT is below 0.2V, the LED current is 10% of the nominal setting. When BRT voltage is 2V or above, the LED current is 100% of the normal setting.

PWM Brightness Control Input. DBRT controls the LED brightness by turning the LED on and off using a PWM signal. The brightness is proportional to the PWM duty.

Fault Output. FLT is an open-drain output. Connect a pull-up resistor between BIAS and FLT.

Over-voltage protection Input. Use a voltage divider to set the boost regulator output over-voltage protection threshold.

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Datasheet ID: AOZ1960DI 516322